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			<div class="post-949 post type-post status-publish format-standard hentry category-hardware category-networking tag-2-4-ghz tag-antenna tag-antenna-designs tag-eagle tag-hardware-2 tag-ism tag-nrf tag-pcb tag-printed-antenna">

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					<h1>2.4 GHz Inverted F Antenna Eagle&nbsp;Library</h1>

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							<span class="time">2012/05/06</span>
																						<span class="post-comments"><a href="https://fabiobaltieri.com/2012/05/06/2-4-ghz-inverted-f-antenna-eagle-library/#comments">16 Comments</a></span>
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					<p>ISM radios for microcontroller are becoming quite popular in 
last years, and if you are designing with wireless radios you have a 
wide choice of transceiver in both sub-gigahertz an 2.4 GHz bandwidth.</p>
<p>If you choose to go for 2.4 GHz, you’ll have the benefits of a wide 
choice of radios, relaxed constraints in protocol design and a small 
size antenna.</p>
<p>Focusing on the antenna, 2.4 GHz radios usually have a differential 
output which have to be adapted to a 50 Ohm single-ended signal suitable
 for Wi-Fi antennas, which can be connected to the radio using an RP-SMA
 connector or directly embedded into the PCB.</p>
<p>This post shows a printed antenna design, kindly provided by 
TI/Chipcon, suitable for 2.4 GHz ISM radios.  You’ll also find a link 
for an Eagle library with some tuning variant.</p>
<p><img src="2.4%20GHz%20Inverted%20F%20Antenna%20Eagle%20Library%20%20%20fabiobaltieri_files/ifa.jpg" alt="https://fabiobaltieri.files.wordpress.com/2012/05/ifa.jpg" class="aligncenter"><span id="more-949"></span></p>
<p><strong>2.4 GHz Transceivers</strong></p>
<p>All major microcontroller manufacturer provides radio-enable MCU or 
external radios.  Using an external SPI-driven radio simplify software 
design, as you can reuse the same code on nodes with different 
architectures, creating a mix of nodes using microcontroller, SoC and 
standard PCs.</p>
<p>Most 2.4 GHz radios are designed for use with IEEE 802.15.4 stacks 
(including ZigBee and 6LoWPAN) but others are explicitly designed to 
simplify the implementation of a custom stack (like the Nordic <a href="http://www.nordicsemi.com/eng/Products/2.4GHz-RF">nRF24</a> series).</p>
<p>Independently of the radio chip, if you are using a general purpose 
2.4 GHz antenna, you have to include the hardware necessary to adapt the
 output of the radio to a single-ended 50 Ohm line as specified by 
device’s datasheet.  That’s what every external antenna and most printed
 antennas use.</p>
<p><img src="2.4%20GHz%20Inverted%20F%20Antenna%20Eagle%20Library%20%20%20fabiobaltieri_files/ifa-nrf.jpg" alt="https://fabiobaltieri.files.wordpress.com/2012/05/ifa-nrf.jpg" class="aligncenter"></p>
<p><strong>Antenna designs</strong></p>
<p>2.4 GHz signals imply a quarter-wave of about 31mm (that’s 1.22 
inches for you, imperial friends), so that’s going to be about the major
 size of most unfolded printed antennas, like the one showed in this 
post.  If your design has tighter size constraints look for a 
folded-design, which is what is commonly used in usb-keys.</p>
<p>When using a printed antenna, you have to be sure that the design 
matches your board stackup – or is stackup-independent at all.  That can
 be a problem as most dual-layer printed antennas are designed for thin 
stackups, while hobbyist PCBs are usually standard 1.6mm thick.</p>
<p>One of the better place to get free information about printed antenna designs is the <a href="http://www.ti.com/product/cc2520#appNote">Application Note</a> section of TI’s website.  Here you’ll find some really good design for both a <a href="http://www.ti.com/litv/pdf/swra117d">folded</a> and <a href="http://www.ti.com/litv/pdf/swru120b">unfolded</a> antenna and a comparrison <a href="http://www.ti.com/litv/pdf/swra351">chart</a> of all their antenna designs.</p>
<p><strong>TI/Chipcon IFA (Inverted F Antenna)</strong></p>
<p>This is an implementation of TI’s Inverted F Antenna (DN007) which 
I’m currently using with an AVR-driven Nordic nRF24L01+ general-purpose 
radio.</p>
<p><img src="2.4%20GHz%20Inverted%20F%20Antenna%20Eagle%20Library%20%20%20fabiobaltieri_files/ifa-eagle.png" alt="https://fabiobaltieri.files.wordpress.com/2012/05/ifa-eagle.png" class="aligncenter"><br>
<img src="2.4%20GHz%20Inverted%20F%20Antenna%20Eagle%20Library%20%20%20fabiobaltieri_files/ifa-pcb.jpg" alt="https://fabiobaltieri.files.wordpress.com/2012/05/ifa-pcb.jpg" class="aligncenter"></p>
<p>The symbol is provided with the main element tunable from the 
suggested design from -3mm to +5mm.  That’s because tuning is influenced
 by many external factors, and have to be done with the antenna in the 
working environment to be correct.</p>
<p>Fot further details, see the original application note: <a href="http://www.ti.com/litv/pdf/swru120b">DN007</a>.</p>
<p><strong>Tuning</strong></p>
<p>Antenna tuning is really easy, &lt;irony&gt;you just need a friend with a network analyzer capable of doing <a href="http://en.wikipedia.org/wiki/Standing_wave_ratio">SWR</a> analysis!&lt;/irony&gt;</p>
<p>If you have that, you probably already know what to do: just design 
the board with the longer variant of the antenna, connect the analyzer 
and cut down the antenna until the natural resonance matches the desired
 range, usually 2.4 to 2.5 GHz.  The easiest way to strip the antenna is
 to remove some of the solder mask, slice out the part to be removed, 
and then heat up the excess copper using a solder iron until it detach 
itself from the PCB.</p>
<p>In my design, I had to cut the antenna down to the -2 marker.</p>
<p><img src="2.4%20GHz%20Inverted%20F%20Antenna%20Eagle%20Library%20%20%20fabiobaltieri_files/ifa-cut.jpg" alt="https://fabiobaltieri.files.wordpress.com/2012/05/ifa-cut.jpg" class="aligncenter"></p>
<p>That’s how the cut antenna looks like.  You can see from the picture 
that the layout provide a path from the antenna feed point to an RP-SMA 
connector, used for tuning.</p>
<p>If you don’t have such instrumentation available, it’s probably better to just use the default tuning (the +0 variant).</p>
<p><strong>Eagle Library</strong></p>
<p>The eagle library is part of a board I designed recently to test the 
Nordic radio transceiver.  You can find the lbr file with just the 
antenna <a href="https://github.com/fabiobaltieri/avr-nrf/blob/master/hardware/antenna.lbr?raw=true">here</a>.</p>
<p><a href="https://github.com/fabiobaltieri/avr-nrf/blob/master/hardware/antenna.lbr?raw=true"><br>
<img src="2.4%20GHz%20Inverted%20F%20Antenna%20Eagle%20Library%20%20%20fabiobaltieri_files/ifa-link.png" style="border-width:0;" alt="lbr"><br>
</a></p>
<p>The layout has been tuned to pass BatchPCB DRC bot, so you can easily use this design with low-cost PCB manufacturing services.</p>
<p><strong>Further Resources</strong></p>
<p>TI probably has the best free application notes for printed antenna 
design, including also some differential layout which requires no 
matching network for their CC-series chips.  Just point to the page of 
one of their 2.4 GHz <a href="http://www.ti.com/product/cc2520#appNote">product</a> and grab all the PDFs you can.</p>
<p>Nordic Semiconductor also has an antenna <a href="http://www.nordicsemi.com/eng/nordic/download_resource/8774/3/79866739">design guide</a>, which is really basic, but is worth reading anyway.</p>
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						<span class="tags">Tagged with <a href="https://fabiobaltieri.com/tag/2-4-ghz/" rel="tag">2.4 GHz</a>, <a href="https://fabiobaltieri.com/tag/antenna/" rel="tag">antenna</a>, <a href="https://fabiobaltieri.com/tag/antenna-designs/" rel="tag">antenna designs</a>, <a href="https://fabiobaltieri.com/tag/eagle/" rel="tag">eagle</a>, <a href="https://fabiobaltieri.com/tag/hardware-2/" rel="tag">hardware</a>, <a href="https://fabiobaltieri.com/tag/ism/" rel="tag">ISM</a>, <a href="https://fabiobaltieri.com/tag/nrf/" rel="tag">nrf</a>, <a href="https://fabiobaltieri.com/tag/pcb/" rel="tag">pcb</a>, <a href="https://fabiobaltieri.com/tag/printed-antenna/" rel="tag">printed antenna</a></span>					</p>
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			<div id="comments">
	

	<h3 id="comments-title">16 Responses to <em>2.4 GHz Inverted F Antenna Eagle&nbsp;Library</em>	</h3>

	<ol class="commentlist snap_preview">
				<li class="comment even thread-even depth-1 highlander-comment" id="li-comment-211">
		<div id="comment-211">
		<div class="comment-author vcard">
			<img alt="" src="2.4%20GHz%20Inverted%20F%20Antenna%20Eagle%20Library%20%20%20fabiobaltieri_files/fire-dragon-nextyear2010_normal.jpg" class="avatar avatar-40" width="40" height="40">			<cite class="fn"><a href="http://twitter.com/nocleverhandle" rel="external nofollow" class="url">Pierce Nichols (@nocleverhandle)</a></cite> <span class="says">says:</span>		</div>
		
		<div class="comment-meta commentmetadata"><a href="https://fabiobaltieri.com/2012/05/06/2-4-ghz-inverted-f-antenna-eagle-library/#comment-211">2012/05/12 at 15:31</a></div>

		<div class="comment-body"><p>I notice that your matching network looks
 like a bunch of caps, rather than an SMD balun or the like. Can you 
comment a bit on how that works? Also, is the board designed to be 
jumper switchable between the external and printed antennas?</p>
</div>

		<div class="reply">
			<a rel="nofollow" class="comment-reply-link" href="https://fabiobaltieri.com/2012/05/06/2-4-ghz-inverted-f-antenna-eagle-library/?replytocom=211#respond" onclick='return addComment.moveForm( "comment-211", "211", "respond", "949" )' aria-label="Reply to Pierce Nichols (@nocleverhandle)">Reply</a>		</div>
	</div>

	<ul class="children">
		<li class="comment byuser comment-author-fabiobaltieri bypostauthor odd alt depth-2 highlander-comment" id="li-comment-212">
		<div id="comment-212">
		<div class="comment-author vcard">
			<img alt="" src="2.4%20GHz%20Inverted%20F%20Antenna%20Eagle%20Library%20%20%20fabiobaltieri_files/9316867f55badf12db1d3da5ee59e93d.jpg" class="avatar avatar-40" width="40" height="40">			<cite class="fn"><a href="https://fabiobaltieri.wordpress.com/" rel="external nofollow" class="url">fabiobaltieri</a></cite> <span class="says">says:</span>		</div>
		
		<div class="comment-meta commentmetadata"><a href="https://fabiobaltieri.com/2012/05/06/2-4-ghz-inverted-f-antenna-eagle-library/#comment-212">2012/05/12 at 16:09</a></div>

		<div class="comment-body"><p>Hi Pierce,</p>
<p>you’re right, there are a lot of passive components for the matching 
network, including capacitors and RF chokes. The reason why I used that 
circuit instead of a balun is just because I re-used the components from
 a pre-assembled breakout board of the chip. Those are easier to find on
 ebay and have an overall cost much lower than the IC and a balun from 
distributors.</p>
<p>About the design, that’s implemented 1:1 from chip’s datasheet (chapter 11 – application example).</p>
<p>About the SMD balun, Nordic provides an application note with the 
part number of a compatible balun (Johanson 2450BM14A0002), but that’s 
even harder to obtain and maybe quite difficult to hand-solder.</p>
<p>As for the switch, I just added two SMD pads to be soldered together.
 A common jumper on a 2.4GHz signal doesn’t sound like a really good 
idea… But an RF switch would be great! Just hard to find on eBay :-)</p>
<p>Anyway, this post was just meant to show TI’s printed antenna. I’ll 
try to cover the whole ATMega32U2 + nRF24L01p circuit/firmware on 
another post.</p>
<p>Thanks for the comment!</p>
</div>

		<div class="reply">
			<a rel="nofollow" class="comment-reply-link" href="https://fabiobaltieri.com/2012/05/06/2-4-ghz-inverted-f-antenna-eagle-library/?replytocom=212#respond" onclick='return addComment.moveForm( "comment-212", "212", "respond", "949" )' aria-label="Reply to fabiobaltieri">Reply</a>		</div>
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	</li><!-- #comment-## -->
</ul><!-- .children -->
</li><!-- #comment-## -->
		<li class="comment even thread-odd thread-alt depth-1 highlander-comment" id="li-comment-223">
		<div id="comment-223">
		<div class="comment-author vcard">
			<img alt="" src="2.4%20GHz%20Inverted%20F%20Antenna%20Eagle%20Library%20%20%20fabiobaltieri_files/1dc60ea62e6203fa75b1e7305712bff2.png" class="avatar avatar-40" width="40" height="40">			<cite class="fn">Chris</cite> <span class="says">says:</span>		</div>
		
		<div class="comment-meta commentmetadata"><a href="https://fabiobaltieri.com/2012/05/06/2-4-ghz-inverted-f-antenna-eagle-library/#comment-223">2012/05/21 at 22:14</a></div>

		<div class="comment-body"><p>Hey, just wanted to thank you for your eagle design :)</p>
<p>I am not an antenna engineer either, but I am currently doing a few 
breakout boards for the AT86RF231 chip (fur fun, not for profit) where I
 want to compare a few different antenna designs (TI’s meander and 
inverted f, a wire lambda/4 and a chip antenna). I originally didn’t 
want to include the F-antenna, because it’s really big, but when it’s 
that easy, why not? If you want I’ll let you know how it goes.</p>
<p>I have also did some work with the Nordic chip in the past, may I ask
 why you go through all the trouble of designing your own RF circuitry, 
when you can just buy those awesomely cheap breakout-boards on the net 
based on Nordic’s reference design?</p>
</div>

		<div class="reply">
			<a rel="nofollow" class="comment-reply-link" href="https://fabiobaltieri.com/2012/05/06/2-4-ghz-inverted-f-antenna-eagle-library/?replytocom=223#respond" onclick='return addComment.moveForm( "comment-223", "223", "respond", "949" )' aria-label="Reply to Chris">Reply</a>		</div>
	</div>

	<ul class="children">
		<li class="comment byuser comment-author-fabiobaltieri bypostauthor odd alt depth-2 highlander-comment" id="li-comment-224">
		<div id="comment-224">
		<div class="comment-author vcard">
			<img alt="" src="2.4%20GHz%20Inverted%20F%20Antenna%20Eagle%20Library%20%20%20fabiobaltieri_files/9316867f55badf12db1d3da5ee59e93d.jpg" class="avatar avatar-40" width="40" height="40">			<cite class="fn"><a href="https://fabiobaltieri.wordpress.com/" rel="external nofollow" class="url">fabiobaltieri</a></cite> <span class="says">says:</span>		</div>
		
		<div class="comment-meta commentmetadata"><a href="https://fabiobaltieri.com/2012/05/06/2-4-ghz-inverted-f-antenna-eagle-library/#comment-224">2012/05/21 at 22:37</a></div>

		<div class="comment-body"><p>Hi Chris,</p>
<p>I agree that inverted-F is quite big, but unless you are designing an
 USB key-sized PCB, it should be a decent compromise… also I think it 
looks cooler than meander for what it matters! :P</p>
<p>As for the breakout, I actually brought some awesomely cheap 
breakout-board based on Nordic reference and than recycled the 
components to mount my board (hot-air rules here).  I see that that’s 
actually a bit crazy, but I also wanted to compare the antenna design (a
 meander on breakout i brought, the inverted-F and external antennas 
like dipole or waveguide on SMA).</p>
<p>No problem for the eagle library, share a link if you publish your 
test results – I’m very interested in that (I’m doing it for fun 
either)!</p>
<p>I’m also looking forward to some AT86RFxxx-based design, they looks 
really good on the paper, but seems to be quite complicated to use 
without any external 802.15.4 library.  Are you using a custom stack?</p>
<p>Fabio</p>
</div>

		<div class="reply">
			<a rel="nofollow" class="comment-reply-link" href="https://fabiobaltieri.com/2012/05/06/2-4-ghz-inverted-f-antenna-eagle-library/?replytocom=224#respond" onclick='return addComment.moveForm( "comment-224", "224", "respond", "949" )' aria-label="Reply to fabiobaltieri">Reply</a>		</div>
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	</li><!-- #comment-## -->
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		<li class="comment even thread-even depth-1 highlander-comment" id="li-comment-225">
		<div id="comment-225">
		<div class="comment-author vcard">
			<img alt="" src="2.4%20GHz%20Inverted%20F%20Antenna%20Eagle%20Library%20%20%20fabiobaltieri_files/1dc60ea62e6203fa75b1e7305712bff2.png" class="avatar avatar-40" width="40" height="40">			<cite class="fn">Chris</cite> <span class="says">says:</span>		</div>
		
		<div class="comment-meta commentmetadata"><a href="https://fabiobaltieri.com/2012/05/06/2-4-ghz-inverted-f-antenna-eagle-library/#comment-225">2012/05/22 at 00:44</a></div>

		<div class="comment-body"><p>So, how did the Nordic design do compared to the F-antenna?</p>
<p>Actually i chose the AT86RF because it seems really well supported. 
There is code (and a whole thoroughly tested 6LoWPAN stack) in Contiki, 
which has already been ported to AVR. There’s also a Linux driver for it
 in the Linux-Zigbee project.</p>
<p>I’ll publish it here: <a href="http://blog.flokati.tk/" rel="nofollow">http://blog.flokati.tk/</a> The AT86RF board will be pin-compatible to the NRF board, so I can put it in my protoboards.</p>
</div>

		<div class="reply">
			<a rel="nofollow" class="comment-reply-link" href="https://fabiobaltieri.com/2012/05/06/2-4-ghz-inverted-f-antenna-eagle-library/?replytocom=225#respond" onclick='return addComment.moveForm( "comment-225", "225", "respond", "949" )' aria-label="Reply to Chris">Reply</a>		</div>
	</div>

	<ul class="children">
		<li class="comment byuser comment-author-fabiobaltieri bypostauthor odd alt depth-2 highlander-comment" id="li-comment-227">
		<div id="comment-227">
		<div class="comment-author vcard">
			<img alt="" src="2.4%20GHz%20Inverted%20F%20Antenna%20Eagle%20Library%20%20%20fabiobaltieri_files/9316867f55badf12db1d3da5ee59e93d.jpg" class="avatar avatar-40" width="40" height="40">			<cite class="fn"><a href="https://fabiobaltieri.wordpress.com/" rel="external nofollow" class="url">fabiobaltieri</a></cite> <span class="says">says:</span>		</div>
		
		<div class="comment-meta commentmetadata"><a href="https://fabiobaltieri.com/2012/05/06/2-4-ghz-inverted-f-antenna-eagle-library/#comment-227">2012/05/22 at 21:03</a></div>

		<div class="comment-body"><p>I did not run any serious test yet, but 
at first sight inverted-F and the meander i had on the breakouts (they 
looked the same as the one on your blog!) seem to perform quite 
similarly, while an external dipole (a standard wifi antenna) on SMA is a
 bit better (read: reach some spot better but nothing *that* special).</p>
<p>I’ll try the nordic with my wifi cantenna if I’ll ever find some time and place to do that! :)</p>
<p>Contiki looks like good stuff, and I like the idea of doing something
 with 6LoWPAN in the future. Still, I think it requries a pretty big 
microcontroller, while with the nordic you can do some neat stuff with 
just a ‘tiny!</p>
<p>For linux-zigbee, I see that some part of the patches are being 
integrated into mainline… that may be a reason to get some AT89* radio 
by itself!!</p>
<p>I’m also following this project <a href="http://en.qi-hardware.com/wiki/Ben_WPAN" rel="nofollow">http://en.qi-hardware.com/wiki/Ben_WPAN</a>, they have a linux-zigbee driver and full hw/sw/fw source for an USB-to-AT89something with a really clean USB stack.</p>
<p>Cheers!</p>
</div>

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			<a rel="nofollow" class="comment-reply-link" href="https://fabiobaltieri.com/2012/05/06/2-4-ghz-inverted-f-antenna-eagle-library/?replytocom=227#respond" onclick='return addComment.moveForm( "comment-227", "227", "respond", "949" )' aria-label="Reply to fabiobaltieri">Reply</a>		</div>
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		<li class="comment even thread-odd thread-alt depth-1 highlander-comment" id="li-comment-14023">
		<div id="comment-14023">
		<div class="comment-author vcard">
			<img alt="" src="2.4%20GHz%20Inverted%20F%20Antenna%20Eagle%20Library%20%20%20fabiobaltieri_files/e46cb5ee011ca5574fcc4ec94cb11e18.png" class="avatar avatar-40" width="40" height="40">			<cite class="fn">Dharm</cite> <span class="says">says:</span>		</div>
		
		<div class="comment-meta commentmetadata"><a href="https://fabiobaltieri.com/2012/05/06/2-4-ghz-inverted-f-antenna-eagle-library/#comment-14023">2015/04/09 at 10:14</a></div>

		<div class="comment-body"><p>Can i go with this IFA antenna design in my nRF51822 BLE module design?</p>
</div>

		<div class="reply">
			<a rel="nofollow" class="comment-reply-link" href="https://fabiobaltieri.com/2012/05/06/2-4-ghz-inverted-f-antenna-eagle-library/?replytocom=14023#respond" onclick='return addComment.moveForm( "comment-14023", "14023", "respond", "949" )' aria-label="Reply to Dharm">Reply</a>		</div>
	</div>

	<ul class="children">
		<li class="comment byuser comment-author-fabiobaltieri bypostauthor odd alt depth-2 highlander-comment" id="li-comment-14027">
		<div id="comment-14027">
		<div class="comment-author vcard">
			<img alt="" src="2.4%20GHz%20Inverted%20F%20Antenna%20Eagle%20Library%20%20%20fabiobaltieri_files/9316867f55badf12db1d3da5ee59e93d.jpg" class="avatar avatar-40" width="40" height="40">			<cite class="fn"><a href="https://fabiobaltieri.wordpress.com/" rel="external nofollow" class="url">fabiobaltieri</a></cite> <span class="says">says:</span>		</div>
		
		<div class="comment-meta commentmetadata"><a href="https://fabiobaltieri.com/2012/05/06/2-4-ghz-inverted-f-antenna-eagle-library/#comment-14027">2015/04/09 at 21:18</a></div>

		<div class="comment-body"><p>Hey Dharm, sure thing, this worked great 
for me in different 24l01+ designs, it should be fine with anything in 
the 2.4GHz band that has a 50 Ohm matching (such as all baluns linked in
 the device website).</p>
</div>

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		<div id="comment-14096">
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			<img alt="" src="2.4%20GHz%20Inverted%20F%20Antenna%20Eagle%20Library%20%20%20fabiobaltieri_files/e46cb5ee011ca5574fcc4ec94cb11e18.png" class="avatar avatar-40" width="40" height="40">			<cite class="fn">Dharm</cite> <span class="says">says:</span>		</div>
		
		<div class="comment-meta commentmetadata"><a href="https://fabiobaltieri.com/2012/05/06/2-4-ghz-inverted-f-antenna-eagle-library/#comment-14096">2015/04/14 at 08:18</a></div>

		<div class="comment-body"><p>Hi,<br>
Thank you for reply,</p>
<p>Can you help me out in layout as i am confused,<br>
Silicon LAbs says to not use pouring on top layer while texas has used top layer pouring.</p>
<p>I have used stack layer as follow, pls share your feedback:<br>
1) RF routing + Poured GND plan<br>
2) Ground Plan<br>
3) Power Plan<br>
4) Ground plan</p>
<p>where in design all vias connect to both ground plan(Layer 2 and Layer 4).</p>
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		<li class="comment byuser comment-author-fabiobaltieri bypostauthor odd alt depth-3 highlander-comment" id="li-comment-14100">
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			<img alt="" src="2.4%20GHz%20Inverted%20F%20Antenna%20Eagle%20Library%20%20%20fabiobaltieri_files/9316867f55badf12db1d3da5ee59e93d.jpg" class="avatar avatar-40" width="40" height="40">			<cite class="fn"><a href="https://fabiobaltieri.wordpress.com/" rel="external nofollow" class="url">fabiobaltieri</a></cite> <span class="says">says:</span>		</div>
		
		<div class="comment-meta commentmetadata"><a href="https://fabiobaltieri.com/2012/05/06/2-4-ghz-inverted-f-antenna-eagle-library/#comment-14100">2015/04/14 at 20:29</a></div>

		<div class="comment-body"><p>Well I think the TI design is filled 
because it’s on a two layer PCB. If you use a four layer stackup you are
 probably going for a thin prepreg between layer 1 and 2 right? In that 
case I would guess that you should just remove the filling below the 
antenna (as by TI application note) and it’s probably going to perform 
in the same way. That’s a best guess though – I don’t actually know much
 of RF and don’t have any RF Engineer at beer range anymore. :-)</p>
</div>

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		<li class="comment even thread-even depth-1 highlander-comment" id="li-comment-21542">
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			<img alt="" src="2.4%20GHz%20Inverted%20F%20Antenna%20Eagle%20Library%20%20%20fabiobaltieri_files/de7de306ff5fdd7cf30ec92a8e5f0283.png" class="avatar avatar-40" width="40" height="40">			<cite class="fn">Sai Teja Manchukanti</cite> <span class="says">says:</span>		</div>
		
		<div class="comment-meta commentmetadata"><a href="https://fabiobaltieri.com/2012/05/06/2-4-ghz-inverted-f-antenna-eagle-library/#comment-21542">2017/11/23 at 11:41</a></div>

		<div class="comment-body"><p>What is the recommended dielectric for 2 
layer PCB to use this IFA PCB antenna. I would be more helpful if you 
can provide complete 2 layer PCB stack up for using this IFA PCB antenna</p>
</div>

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			<a rel="nofollow" class="comment-reply-link" href="https://fabiobaltieri.com/2012/05/06/2-4-ghz-inverted-f-antenna-eagle-library/?replytocom=21542#respond" onclick='return addComment.moveForm( "comment-21542", "21542", "respond", "949" )' aria-label="Reply to Sai Teja Manchukanti">Reply</a>		</div>
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		<li class="comment byuser comment-author-fabiobaltieri bypostauthor odd alt depth-2 highlander-comment" id="li-comment-21631">
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			<img alt="" src="2.4%20GHz%20Inverted%20F%20Antenna%20Eagle%20Library%20%20%20fabiobaltieri_files/9316867f55badf12db1d3da5ee59e93d.jpg" class="avatar avatar-40" width="40" height="40">			<cite class="fn"><a href="https://fabiobaltieri.wordpress.com/" rel="external nofollow" class="url">fabiobaltieri</a></cite> <span class="says">says:</span>		</div>
		
		<div class="comment-meta commentmetadata"><a href="https://fabiobaltieri.com/2012/05/06/2-4-ghz-inverted-f-antenna-eagle-library/#comment-21631">2017/12/05 at 23:22</a></div>

		<div class="comment-body"><p>Does it matter? The opposite layer is empty…</p>
<h2>Checking the original application note (<a href="http://www.ti.com/lit/an/swru120c/swru120c.pdf" rel="nofollow">http://www.ti.com/lit/an/swru120c/swru120c.pdf</a>):</h2>
<h2>Because there is no ground plane beneath the antenna, the PCB 
thickness will have little effect on the performance. The results 
presented in this document are based on an antenna implemented on a PCB 
with a 1-mm thickness.</h2>
<p>The one on the picture is on a standard 1.6mm FR4.</p>
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			<img alt="" src="2.4%20GHz%20Inverted%20F%20Antenna%20Eagle%20Library%20%20%20fabiobaltieri_files/ff9184abf6c2d452c95e8e8d556800a0.png" class="avatar avatar-40" width="40" height="40">			<cite class="fn">sriram</cite> <span class="says">says:</span>		</div>
		
		<div class="comment-meta commentmetadata"><a href="https://fabiobaltieri.com/2012/05/06/2-4-ghz-inverted-f-antenna-eagle-library/#comment-22763">2018/07/16 at 12:43</a></div>

		<div class="comment-body"><p>iam unable to download the library file..if i click the link it opens a page with programing code..how do i execute it</p>
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			<a rel="nofollow" class="comment-reply-link" href="https://fabiobaltieri.com/2012/05/06/2-4-ghz-inverted-f-antenna-eagle-library/?replytocom=22763#respond" onclick='return addComment.moveForm( "comment-22763", "22763", "respond", "949" )' aria-label="Reply to sriram">Reply</a>		</div>
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		<li class="comment byuser comment-author-fabiobaltieri bypostauthor odd alt depth-2 highlander-comment" id="li-comment-22764">
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			<img alt="" src="2.4%20GHz%20Inverted%20F%20Antenna%20Eagle%20Library%20%20%20fabiobaltieri_files/9316867f55badf12db1d3da5ee59e93d.jpg" class="avatar avatar-40" width="40" height="40">			<cite class="fn"><a href="https://fabiobaltieri.wordpress.com/" rel="external nofollow" class="url">fabiobaltieri</a></cite> <span class="says">says:</span>		</div>
		
		<div class="comment-meta commentmetadata"><a href="https://fabiobaltieri.com/2012/05/06/2-4-ghz-inverted-f-antenna-eagle-library/#comment-22764">2018/07/16 at 13:16</a></div>

		<div class="comment-body"><p>Use right click, “save link as”.</p>
</div>

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			<a rel="nofollow" class="comment-reply-link" href="https://fabiobaltieri.com/2012/05/06/2-4-ghz-inverted-f-antenna-eagle-library/?replytocom=22764#respond" onclick='return addComment.moveForm( "comment-22764", "22764", "respond", "949" )' aria-label="Reply to fabiobaltieri">Reply</a>		</div>
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		<li class="comment even depth-3 highlander-comment" id="li-comment-22766">
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			<img alt="" src="2.4%20GHz%20Inverted%20F%20Antenna%20Eagle%20Library%20%20%20fabiobaltieri_files/ff9184abf6c2d452c95e8e8d556800a0.png" class="avatar avatar-40" width="40" height="40">			<cite class="fn">sriram</cite> <span class="says">says:</span>		</div>
		
		<div class="comment-meta commentmetadata"><a href="https://fabiobaltieri.com/2012/05/06/2-4-ghz-inverted-f-antenna-eagle-library/#comment-22766">2018/07/16 at 13:28</a></div>

		<div class="comment-body"><p>actually i did..i saved as notepad file..is that right way to do.</p>
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			<img alt="" src="2.4%20GHz%20Inverted%20F%20Antenna%20Eagle%20Library%20%20%20fabiobaltieri_files/ff9184abf6c2d452c95e8e8d556800a0.png" class="avatar avatar-40" width="40" height="40">			<cite class="fn">sriram</cite> <span class="says">says:</span>		</div>
		
		<div class="comment-meta commentmetadata"><a href="https://fabiobaltieri.com/2012/05/06/2-4-ghz-inverted-f-antenna-eagle-library/#comment-22765">2018/07/16 at 13:27</a></div>

		<div class="comment-body"><p>actually i did..i saved as notepad file..is that right way to do.</p>
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